3-thiophenecarboxylic acid, 4-(4-ethoxyphenyl)-5-methyl-2-[(3-methyl-1-oxo-2-buten-1-yl)amino]-, methyl ester;Methyl 4-(4-ethoxyphenyl)-5-methyl-2-[(3-methylbut-2-enoyl)amino]thiophene-3-carboxylate
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